Countermeasure of rebound reducing for wet-mixed steel fiber reinforced shotcrete

강섬유보강 습식 숏크리트의 리바운드 저감대책

  • 임주영 (서울산업대학교 철도전문대학원, 삼성물산(주) 건설부문 토목공사팀장) ;
  • 박해균 (삼성물산(주) 건설부문 토목기술팀) ;
  • 이명섭 (삼성물산(주) 건설부문 토목기술팀) ;
  • 조남섭 ((주)유니온 부설연구소)
  • Published : 2004.10.01

Abstract

From the early 1980's, the New Austrian Tunnelling Method (NATM) has been developed as a one of the standard tunneling method in Korea. Owing to the results of many researches, the practical problems of shotcrete has been improved for a last decade. However, the excess amount of rebound still remains one of the critical problems in shotcrete technology. In order to improve for this rebound problem, recently developed cement mineral accelerator has been successfully applied to several NATM tunnels in Korea. An experimental investigation was carried out in order to verify the rebound characteristics of wet-mix Steel Fiber Reinforced Shotcrete (SFRS) with powder types cement mineral accelerator. Mortar setting test, SEM analysis, bonding test under spring water condition and rebound test were conducted. From the result, wet-mix SFRS with cement mineral acelerator exhibited excellent bonding characteristics even spring water condition and less rebound ratio compared to the conventional liquid accelerator.

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